Clean up deprecated '_' prefixes and use new helper methods. (#1209)
Clean up deprecated '_' prefixes and use new helper methods. (#1209)


PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs